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the cord that gets plugged in for the winter just works the block heater and warms the engine coolant to make winter starting easier. if you can not control blower motor fan speed then you probably have a bad blower resister or blower motor, that will need to be replaced. if the fan has been wired to the block heater wiring(plug)then it has to be disconnected and put back to original. the block heater works on household voltage120 volts) and the blower motor works on 12 volts. the blower motor may be burnt out due to the excess voltage supplied to it. check fuses as it may have burnt a fuse. depending on the damage caused you may have to take it to a repair shop to have things fixed properly.
is there anything ells not working.like cigarette lighter. etc. there is a relay to start from ignition feeds power from a low volt system to a high volt system for the blower motor. usually a long black relay with 2 small connectors and 2 large connectors some have 3 small ones.
by heater i take it you mean the blower motor.these work on a fuse and or relay and a set of resistors.but start by checking the fuse as you said you have no poower.if the fuse is ok then check for power at the plug on the blower motor, you will have to disconnect the plug at the blower motor and have a tester placed on 12 volts to perform this test.turn ignition to the on position and turn on the heater unit,you should have a reading of some kind .if you have up to 12 volts then the wiring and fuseare ok. the problem then would be the blower motorbut after removal you could always check the motor by hooking it up to a 12 volt power source to see if it turns.
You need to check the blower motor to see if it has power going to it.Get volt meter hook the red end to the blower plug and put the black to a ground now turn the key and the fan on and see if you have 12 volts or more.If you do it most likly the blower motor
Ive ran across this many times its usually the blower motor but I found that if I replace the blower and the replacement plug(thru GM)that the vehicles never had a blower issue again,so order up a motor and plug and be sure to solder the new plug dont use crimp fittings.have a good day DB
hello your heater blower fan is located in your heater box pass you will see a stop sign shaped flat flared end metal piece about 6inches diameter all the way around held in with either 6 or 8 1/4bolt heads unscrew these unplug wire feed pry lightly away from box fan assembly will come right out if your blower moter doesnt come with plastic fan fins you will need to use the old one usaully held on with a clip once removed slide off the fan shaft install to new motor reintall if no gasket take black permatex apply a thin coat around outer edge of new fan tighten plug power back on done goodluck